I am a bit confused in your question? Can you provide us with a little more detail in what you need help with. Is it possible to add a animated banner to your website? Yes it is. Not sure what you mean by 3"wide and 5/8"deep.

Using CoffeeCups Animation Maker you can make an animated banner any size you like. It is not however a 'banner maker' program. You simply create or buy your graphics, then load them into the Animation Maker. It will create an animated GIF from your graphics simply by cycling through them using the specifications you choose. Another cool feature of the program is the 'Living Picture'. You can read more about these features here... http://www.coffeecup.com/animation-studio/